I got it, thank you for the detail response. But here is one problem, I have divided these sentence into different category, such as: revenue, cost, profit and so on, because the same word will have different tone in different environment, for example, the word increase. If it appears in the sentence about revenue, it is positive. However, if it appears in the sentence about cost, it is negative. So how can I make some modification in the code you just provided to implement this function? Thanks again!!!!